First of all I can say I am impressed with the look you have, don't change that . Traffic wise, you could implement something that posts each auction/sale on Facebook, Twitter each time it is published. If the site is for a local company to you, you could make some flyers and pay someone to deliver them in a pre-defined targeted area. Speed wise, does your hosting provider enable gZip compression? That would help with loading times of your site's pages. Also if you wanted to you could put text-based Adsense ads on your site - don't use banners as that could distract your visitors from seeing the pictures of cars you have on your site.

I'd also like some feedback for my site https://bitly.com/downloadthatmovie+. It is only about a month old so not really ranking for anything yet, but a significant amount of my traffic comes from Google and Facebook. The site was created using a method on here...

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